I have experienced that in a Hybrid environment there are some mail account that are not showing up in the EAC. I can see them in the Office 365 portal, and in Active Directory on-prem. To fix this we need to link the account. Open PowerShell and connect to "ExchangeOnlineManagement" and run this command:
Get-Mailbox “username” | fl ExchangeGuid
This will give you the GUID for the account, save it for the next step
On the on-prem Exchange server, open EMS and run this command:
Enable-RemoteMailbox “username” -RemoteRoutingAddress username@domain.com
Then the final command (also in EMS):
Set-RemoteMailbox “username” -ExchangeGuid <ExchangeGuid>
Another issue I have experienced that I wanted to add to this blog is when in a Hybrid, on-prem Exchange server don't host the mailbox after migration, but the EXO claim that the mailbox is still on-prem, there is 2 values that need to be cleared in on-prem AD:
msExchMailboxGuid
targetAddress
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